<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<input type="checkbox" id="ck"/>
<hr/>
<div id="div">
    <input type="checkbox"/><br/>
    <input type="checkbox"/><br/>
    <input type="checkbox"/><br/>
    <input type="checkbox"/><br/>
    <input type="checkbox"/>
</div>
<script type="text/javascript">
    document.getElementById('ck').onclick = function () {
        let oDiv = document.getElementById('div');
        let arrInputs = oDiv.children;
        for (let i = 0; i < arrInputs.length; i++) {
            let oInput = arrInputs[i];
            oInput.checked=this.checked;
        }
    }
</script>
</body>
</html>